OLED B Click Board™

How Does The OLED B Click Board™ Work?

The OLED B Click Board™ as its foundation uses the MI9639BO-B2, a 19.3x7.8mm 96x39px light blue monochrome passive matrix OLED display from Multi-Inno Technology. The MI9639BO-B2 display features an SSD1306, a 128x64 dot-matrix OLED/PLED segment/common driver with a controller. The controller has built-in functionalities like contrast control (256-step brightness control), normal or inverse image display, vertical and horizontal scrolling functions, and much more accessible through the I2C serial interface.

OLEDs are emissive and don't require a separate backlight as LCD technology does, reducing the OLED display's overall power consumption compared to LCDs. It also does not suffer from loss of contrast due to bleed-through of the backlight in the "off" pixels. OLEDs, being emissive, have a consistent contrast ratio greater than 100:1 with no limitation in viewing angle. In addition, they don't suffer from temperature-related response time delays and contrast changes.

Like any OLED display, the MI9639BO-B2 is made from a thin film of an organic compound that emits light when exposed to a current. A small monochrome display like this one represents an ideal solution for displaying text or icons. The MI9639BO-B2 display is bright, has a wide viewing angle, and low power consumption.

In addition to the display's main power supply, taken from the +3.3V microBUS™ power rail, the MI9639BO-B2 has another power pin, more precisely the power supply for DC/DC converter circuit. This pin is the power supply pin for the internal buffer of the DC/DC voltage converter. Therefore, for this pin, the Click board™ uses a low dropout linear regulator AP7331 from Diodes Incorporated, providing a 3.6V power supply out of 5V mikroBUS™ rail.

The OLED B Click Board™ communicates with MCU using the standard I2C 2-Wire interface to read data and configure settings. It provides the possibility of the communication-enable feature routed to the CS pin of the mikroBUS™ socket, enabling the OLED B Click for MCU communication only when the CS pin is pulled to a low logic state. In addition, it has two more pins. First is related to the reset function, routed to the RST pin on the mikroBUS™ socket (when the pin is in a low logic state, the initialization of the chip is executed), and the second labelled as D/C and routed to the PWM pin on the mikroBUS™ socket is I2C slave address selection pin.

NOTE: If the noise accidentally occurs at the displaying window during the operation, please reset the display to recover the display function.

The OLED B Click Board™ is designed to be operated only with a 3.3V logic voltage level, while 5V is used as a supply voltage of the AP7331 LDO. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS

PINOUT DIAGRAM

This table shows how the pinout of the OLED B Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
NC	1	AN	PWM	16	D/C	I2C Slave Address Selection
Reset	RST	2	RST	INT	15	NC
Communication Enable	CS	3	CS	RX	14	NC
NC	4	SCK	TX	13	NC
NC	5	MISO	SCL	12	SCL	I2C Clock
NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

ONBOARD SETTINGS AND INDICATORS

OLED B CLICK ELECTRICAL SPECIFICATIONS